| Business | Phone |
| Anatech Limited 2817 Whipple Rd, Union City 94587 | (510) 489-9666 |
| E-3 Systems 1220 Whipple Rd, Union City 94587 | (510) 487-7393 |
| Nec Tokin America Inc 32950 Alvarado Niles Rd # 500, Union City 94587 | (510) 324-4110 |
| Tyco Electronics Inc 30000 Eigenbrodt Way, Union City 94587 | (510) 324-2295 |